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Exam PHY180 I Spring 2008 Choose the best answer to each question and circle the letter. Some of the questions require you to figure out an answer, and you may write on the exam sheet for drawings or computing. Note that P2 = a3 E= d/a 1. On the summer solstice, Anchorage has 19:36 hours of daylight. What time would the sun set that day? a. 3:48 pm b. 4:36 pm c. 9:30 pm d. 6:00 pm e. 9:48 pm On the summer solstice in Anchorage, what time would sunrise be? a. 4:36 am b. 2:12 am c. 6:18 am d. 9:48 am e. 3:12 am On which two days is the sun directly over the equator? a. February 2 and May 2 b. June 21 and December 21 c. March 21 and September 21 d. August 2 and November 2 e. May 2 and November 2 The time for the sun to return to the same background stars determines a. day b. week c. month d. year e. century. The time from the sun crossing the meridian to again crossing the meridian determines a. day b. week c. month d. year e. century 2 3. 4. 5. 6. If the earth did not rotate at all, how often would you see the moon rise? a. once each 24 hours b. once each week c. once each month d. once each year e. it would never rise or set How often would you see the sun rise from the moon? a. once each 24 hours b. once each week c. once each month d. once each year e. it would never rise or set If you were on the moon when earth sees waning crescent moon, what phase would you see for earth? a. waxing crescent b. waxing gibbous c. waning crescent d. waning gibbous e. full 7. 8. 9. What time does the waning crescent moon set? a. 3 pm b. 9 pm c. midnight d. 3 am e. 9 am What phase of the moon rises at 3 am? a. waxing crescent b. c. waxing gibbous d. e. third quarter 10. waning crescent waning gibbous 11. What is the phase of the moon for a solar eclipse? a. New b. First quarter c. Full Moon d. Third quarter e. Waxing crescent What is the shortest period of time possible between a lunar eclipse and a solar eclipse? a. 2 days b. 2 weeks c. 2 month d. 2 years e. they can occur at anytime Why do eclipses do not occur every month? 12. 13. 14. The interval from new moon to new moon is not the same as the period for the moon to return to the same spot in space because the a. moon is in synchronous rotation b. earth goes around the sun c. earth goes around the moon d. earth produces tides on the moon e. the density of the moon is less than earth 15. If you are standing on the earth's north pole, which of the following will be directly overhead? a. the celestial equator b. the ecliptic c. the zodiac d. the north celestial pole e. the sun 16. If you are standing anywhere on the earth, which of the following will be directly overhead? a. the celestial equator b. the zenith c. the zodiac d. the north celestial pole e. the sun Which is true of the sky observed from Flagstaff? a. there are circumpolar no stars b. some of the sky is circumpolar c. all of our sky is circumpolar d. all of our sky is equatorial e. there are no equatorial stars 17. 18. Which of these bodies shows retrograde motion? a. Mars b. Pluto c. Jupiter d. Neptune e. all of the above When Venus is at inferior conjunction, what phase did earth show from Venus that day? a. New b. First Quarter c. Full d. Waning Gibbous e. Waning Crescent V E 19. 20. 21. When Venus is at greatest elongation (as seen in the diagram to the right, what time does it rise approximately? a. sunset b. two hours before the sun V c. midnight d. two hours after the sun e. you can't tell from the available information E The first astronomer to use a telescope was a. Ptolemy b. Copernicus c. Tycho Brahe d. Kepler e. Galileo Which of the following is NOT one of the discoveries made by Galileo with his telescope that supported the new solar system model? a. spots on the sun b. moons of Jupiter c. mountains and seas on our moon d. the planet Uranus e. the phases of Venus How many bright moons of Jupiter did Galileo discover? a. 1 b. 2 c. 3 d. 4 e. 5 Mars's orbit is about 1.52 AU in radius. How long, in earth years is the orbit of Mars? a. 0.8 year b. 3.5 years c. 1.87 years d. 187 years e. 253 years 22. 23. 24. 25. Galileo used his observations of the changing phases of Venus to demonstrate that a. the sun moves around the earth b. the universe is infinite in size c. the earth is a sphere d. the moon orbits the earth e. Venus follows an orbit around the sun, not earth 26. You are at the earth's South Pole; it is September 21. What will happen that day? a. Polaris rises b. the moon rises c. the sun sets d. Sirius sets e. The sun rises. You are again at the South Pole; it is September 21, and the moon sets. What phase is it? a. new b. first quarter c. full d. third quarter e. waxing crescent Jupiter is rising at sunset. If you were on Jupiter right now, what phase would you see for earth? (Hint: Sketch this out) a. waxing crescent b. new c. waning gibbous d. quarter e. full Write the date each of these events happen. Autumnal equinox: Winter solstice: Vernal equinox: Summer solstice: ________________ ________________ ________________ ________________ 27. 28. 29. 30. If you plotted the exact path the sun makes through the stars for a year you would have made a plot of the _____________? a. Ecliptic b. Celestial equator c. Zenith d. Analemma e. Meridian How often do eclipses (solar and lunar) generally happen? a. Monthly b. Once per year c. Twice per year d. At random intervals e. Quarterly 31. Determine the following characteristics for the following orbit. Semi-major Axis = ________________ AU Eccentricity = _________________ Period = _________________ Years Finally label the Major Axis, and the 2 foci. 30 AU

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